March 2008 S4 B7 GM6 Heads RS4 clone?

I came to put together my B7 S4 I bought as salvage to rebuild is possibly one of few with the GM6 373G/H heads from the rs4 casting. 190amp alternator, and the carbon black titanium trim. Can someone please give me some info?!

what info are you looking for

Everything really JMF trans code thought it was an OA3. Is this a factory revisioned head and block? Did I escape the timing chain failures ? Just wanna know little more about the late production run.